[native_pdf_view] get pdf page count about packages.flutter

[PrismaSoftGC]

  Widget _pdfView(String path) => FutureBuilder<PDFDocument>(
        // Open document
        future: PDFDocument.openAsset(path),
        builder: (_, snapshot) {
          if (snapshot.hasData) {
            qtdPages = snapshot.data.pagesCount;
            return PDFView(
              document: snapshot.data,
              controller: pdfPageController,
              onPageChanged: _onPdfPageChanged,
            );
          }

          if (snapshot.hasError) {
            // Catch
            return Center(
              child: Text(
                'PDF Rendering does not '
                'support on the system of this version',
              ),
            );
          }

          return Center(child: CircularProgressIndicator());
        },
      );

[SergeShkurko]

to render the next page the current one is closed. this is native api rendering. PageView stores in memory 3 or 4 page widgets